/*! iScroll v5.2.0-snapshot ~ (c) 2008-2017 Matteo Spinelli ~ http://cubiq.org/license */
(function (window, document, Math) {
  var rAF =
    window.requestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.oRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    function (callback) {
      window.setTimeout(callback, 1000 / 60);
    };

  var utils = (function () {
    var me = {};

    var _elementStyle = document.createElement("div").style;
    var _vendor = (function () {
      var vendors = ["t", "webkitT", "MozT", "msT", "OT"],
        transform,
        i = 0,
        l = vendors.length;

      for (; i < l; i++) {
        transform = vendors[i] + "ransform";
        if (transform in _elementStyle)
          return vendors[i].substr(0, vendors[i].length - 1);
      }

      return false;
    })();

    function _prefixStyle(style) {
      if (_vendor === false) return false;
      if (_vendor === "") return style;
      return _vendor + style.charAt(0).toUpperCase() + style.substr(1);
    }

    me.getTime =
      Date.now ||
      function getTime() {
        return new Date().getTime();
      };

    me.extend = function (target, obj) {
      for (var i in obj) {
        target[i] = obj[i];
      }
    };

    me.addEvent = function (el, type, fn, capture) {
      el.addEventListener(type, fn, !!capture);
    };

    me.removeEvent = function (el, type, fn, capture) {
      el.removeEventListener(type, fn, !!capture);
    };

    me.prefixPointerEvent = function (pointerEvent) {
      return window.MSPointerEvent
        ? "MSPointer" +
            pointerEvent.charAt(7).toUpperCase() +
            pointerEvent.substr(8)
        : pointerEvent;
    };

    me.momentum = function (
      current,
      start,
      time,
      lowerMargin,
      wrapperSize,
      deceleration
    ) {
      var distance = current - start,
        speed = Math.abs(distance) / time,
        destination,
        duration;

      deceleration = deceleration === undefined ? 0.0006 : deceleration;

      destination =
        current +
        ((speed * speed) / (2 * deceleration)) * (distance < 0 ? -1 : 1);
      duration = speed / deceleration;

      if (destination < lowerMargin) {
        destination = wrapperSize
          ? lowerMargin - (wrapperSize / 2.5) * (speed / 8)
          : lowerMargin;
        distance = Math.abs(destination - current);
        duration = distance / speed;
      } else if (destination > 0) {
        destination = wrapperSize ? (wrapperSize / 2.5) * (speed / 8) : 0;
        distance = Math.abs(current) + destination;
        duration = distance / speed;
      }

      return {
        destination: Math.round(destination),
        duration: duration,
      };
    };

    var _transform = _prefixStyle("transform");

    me.extend(me, {
      hasTransform: _transform !== false,
      hasPerspective: _prefixStyle("perspective") in _elementStyle,
      hasTouch: "ontouchstart" in window,
      hasPointer: !!(window.PointerEvent || window.MSPointerEvent), // IE10 is prefixed
      hasTransition: _prefixStyle("transition") in _elementStyle,
    });

    /*
	This should find all Android browsers lower than build 535.19 (both stock browser and webview)
	- galaxy S2 is ok
    - 2.3.6 : `AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1`
    - 4.0.4 : `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
   - galaxy S3 is badAndroid (stock brower, webview)
     `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
   - galaxy S4 is badAndroid (stock brower, webview)
     `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
   - galaxy S5 is OK
     `AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36 (Chrome/)`
   - galaxy S6 is OK
     `AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36 (Chrome/)`
  */
    me.isBadAndroid = (function () {
      var appVersion = window.navigator.appVersion;
      // Android browser is not a chrome browser.
      if (/Android/.test(appVersion) && !/Chrome\/\d/.test(appVersion)) {
        var safariVersion = appVersion.match(/Safari\/(\d+.\d)/);
        if (
          safariVersion &&
          typeof safariVersion === "object" &&
          safariVersion.length >= 2
        ) {
          return parseFloat(safariVersion[1]) < 535.19;
        } else {
          return true;
        }
      } else {
        return false;
      }
    })();

    me.extend((me.style = {}), {
      transform: _transform,
      transitionTimingFunction: _prefixStyle("transitionTimingFunction"),
      transitionDuration: _prefixStyle("transitionDuration"),
      transitionDelay: _prefixStyle("transitionDelay"),
      transformOrigin: _prefixStyle("transformOrigin"),
      touchAction: _prefixStyle("touchAction"),
    });

    me.hasClass = function (e, c) {
      var re = new RegExp("(^|\\s)" + c + "(\\s|$)");
      return re.test(e.className);
    };

    me.addClass = function (e, c) {
      if (me.hasClass(e, c)) {
        return;
      }

      var newclass = e.className.split(" ");
      newclass.push(c);
      e.className = newclass.join(" ");
    };

    me.removeClass = function (e, c) {
      if (!me.hasClass(e, c)) {
        return;
      }

      var re = new RegExp("(^|\\s)" + c + "(\\s|$)", "g");
      e.className = e.className.replace(re, " ");
    };

    me.offset = function (el) {
      var left = -el.offsetLeft,
        top = -el.offsetTop;

      // jshint -W084
      while ((el = el.offsetParent)) {
        left -= el.offsetLeft;
        top -= el.offsetTop;
      }
      // jshint +W084

      return {
        left: left,
        top: top,
      };
    };

    me.preventDefaultException = function (el, exceptions) {
      for (var i in exceptions) {
        if (exceptions[i].test(el[i])) {
          return true;
        }
      }

      return false;
    };

    me.extend((me.eventType = {}), {
      touchstart: 1,
      touchmove: 1,
      touchend: 1,

      mousedown: 2,
      mousemove: 2,
      mouseup: 2,

      pointerdown: 3,
      pointermove: 3,
      pointerup: 3,

      MSPointerDown: 3,
      MSPointerMove: 3,
      MSPointerUp: 3,
    });

    me.extend((me.ease = {}), {
      quadratic: {
        style: "cubic-bezier(0.25, 0.46, 0.45, 0.94)",
        fn: function (k) {
          return k * (2 - k);
        },
      },
      circular: {
        style: "cubic-bezier(0.1, 0.57, 0.1, 1)", // Not properly "circular" but this looks better, it should be (0.075, 0.82, 0.165, 1)
        fn: function (k) {
          return Math.sqrt(1 - --k * k);
        },
      },
      back: {
        style: "cubic-bezier(0.175, 0.885, 0.32, 1.275)",
        fn: function (k) {
          var b = 4;
          return (k = k - 1) * k * ((b + 1) * k + b) + 1;
        },
      },
      bounce: {
        style: "",
        fn: function (k) {
          if ((k /= 1) < 1 / 2.75) {
            return 7.5625 * k * k;
          } else if (k < 2 / 2.75) {
            return 7.5625 * (k -= 1.5 / 2.75) * k + 0.75;
          } else if (k < 2.5 / 2.75) {
            return 7.5625 * (k -= 2.25 / 2.75) * k + 0.9375;
          } else {
            return 7.5625 * (k -= 2.625 / 2.75) * k + 0.984375;
          }
        },
      },
      elastic: {
        style: "",
        fn: function (k) {
          var f = 0.22,
            e = 0.4;

          if (k === 0) {
            return 0;
          }
          if (k == 1) {
            return 1;
          }

          return (
            e *
              Math.pow(2, -10 * k) *
              Math.sin(((k - f / 4) * (2 * Math.PI)) / f) +
            1
          );
        },
      },
    });

    me.tap = function (e, eventName) {
      var ev = document.createEvent("Event");
      ev.initEvent(eventName, true, true);
      ev.pageX = e.pageX;
      ev.pageY = e.pageY;
      e.target.dispatchEvent(ev);
    };

    me.click = function (e) {
      var target = e.target,
        ev;

      if (!/(SELECT|INPUT|TEXTAREA)/i.test(target.tagName)) {
        // https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/initMouseEvent
        // initMouseEvent is deprecated.
        ev = document.createEvent(window.MouseEvent ? "MouseEvents" : "Event");
        ev.initEvent("click", true, true);
        ev.view = e.view || window;
        ev.detail = 1;
        ev.screenX = target.screenX || 0;
        ev.screenY = target.screenY || 0;
        ev.clientX = target.clientX || 0;
        ev.clientY = target.clientY || 0;
        ev.ctrlKey = !!e.ctrlKey;
        ev.altKey = !!e.altKey;
        ev.shiftKey = !!e.shiftKey;
        ev.metaKey = !!e.metaKey;
        ev.button = 0;
        ev.relatedTarget = null;
        ev._constructed = true;
        target.dispatchEvent(ev);
      }
    };

    me.getTouchAction = function (eventPassthrough, addPinch) {
      var touchAction = "none";
      if (eventPassthrough === "vertical") {
        touchAction = "pan-y";
      } else if (eventPassthrough === "horizontal") {
        touchAction = "pan-x";
      }
      if (addPinch && touchAction != "none") {
        // add pinch-zoom support if the browser supports it, but if not (eg. Chrome <55) do nothing
        touchAction += " pinch-zoom";
      }
      return touchAction;
    };

    me.getRect = function (el) {
      if (el instanceof SVGElement) {
        var rect = el.getBoundingClientRect();
        return {
          top: rect.top,
          left: rect.left,
          width: rect.width,
          height: rect.height,
        };
      } else {
        return {
          top: el.offsetTop,
          left: el.offsetLeft,
          width: el.offsetWidth,
          height: el.offsetHeight,
        };
      }
    };

    return me;
  })();
  function IScroll(el, options) {
    this.wrapper = typeof el == "string" ? document.querySelector(el) : el;
    this.scroller = this.wrapper.children[0];
    this.scrollerStyle = this.scroller.style; // cache style for better performance

    this.options = {
      resizeScrollbars: true,

      mouseWheelSpeed: 20,

      snapThreshold: 0.334,

      // INSERT POINT: OPTIONS
      disablePointer: !utils.hasPointer,
      disableTouch: utils.hasPointer || !utils.hasTouch,
      disableMouse: utils.hasPointer || utils.hasTouch,
      startX: 0,
      startY: 0,
      scrollY: true,
      directionLockThreshold: 5,
      momentum: true,

      bounce: true,
      bounceTime: 600,
      bounceEasing: "",

      preventDefault: true,
      preventDefaultException: { tagName: /^(INPUT|TEXTAREA|BUTTON|SELECT)$/ },

      HWCompositing: true,
      useTransition: true,
      useTransform: true,
      bindToWrapper: typeof window.onmousedown === "undefined",
    };

    for (var i in options) {
      this.options[i] = options[i];
    }

    // Normalize options
    this.translateZ =
      this.options.HWCompositing && utils.hasPerspective
        ? " translateZ(0)"
        : "";

    this.options.useTransition =
      utils.hasTransition && this.options.useTransition;
    this.options.useTransform = utils.hasTransform && this.options.useTransform;

    this.options.eventPassthrough =
      this.options.eventPassthrough === true
        ? "vertical"
        : this.options.eventPassthrough;
    this.options.preventDefault =
      !this.options.eventPassthrough && this.options.preventDefault;

    // If you want eventPassthrough I have to lock one of the axes
    this.options.scrollY =
      this.options.eventPassthrough == "vertical"
        ? false
        : this.options.scrollY;
    this.options.scrollX =
      this.options.eventPassthrough == "horizontal"
        ? false
        : this.options.scrollX;

    // With eventPassthrough we also need lockDirection mechanism
    this.options.freeScroll =
      this.options.freeScroll && !this.options.eventPassthrough;
    this.options.directionLockThreshold = this.options.eventPassthrough
      ? 0
      : this.options.directionLockThreshold;

    this.options.bounceEasing =
      typeof this.options.bounceEasing == "string"
        ? utils.ease[this.options.bounceEasing] || utils.ease.circular
        : this.options.bounceEasing;

    this.options.resizePolling =
      this.options.resizePolling === undefined
        ? 60
        : this.options.resizePolling;

    if (this.options.tap === true) {
      this.options.tap = "tap";
    }

    // https://github.com/cubiq/iscroll/issues/1029
    if (!this.options.useTransition && !this.options.useTransform) {
      if (!/relative|absolute/i.test(this.scrollerStyle.position)) {
        this.scrollerStyle.position = "relative";
      }
    }

    if (this.options.shrinkScrollbars == "scale") {
      this.options.useTransition = false;
    }

    this.options.invertWheelDirection = this.options.invertWheelDirection
      ? -1
      : 1;

    // INSERT POINT: NORMALIZATION

    // Some defaults
    this.x = 0;
    this.y = 0;
    this.directionX = 0;
    this.directionY = 0;
    this._events = {};

    // INSERT POINT: DEFAULTS

    this._init();
    this.refresh();

    this.scrollTo(this.options.startX, this.options.startY);
    this.enable();
  }

  IScroll.prototype = {
    version: "5.2.0-snapshot",

    _init: function () {
      this._initEvents();

      if (this.options.scrollbars || this.options.indicators) {
        this._initIndicators();
      }

      if (this.options.mouseWheel) {
        this._initWheel();
      }

      if (this.options.snap) {
        this._initSnap();
      }

      if (this.options.keyBindings) {
        this._initKeys();
      }

      // INSERT POINT: _init
    },

    destroy: function () {
      this._initEvents(true);
      clearTimeout(this.resizeTimeout);
      this.resizeTimeout = null;
      this._execEvent("destroy");
    },

    _transitionEnd: function (e) {
      if (e.target != this.scroller || !this.isInTransition) {
        return;
      }

      this._transitionTime();
      if (!this.resetPosition(this.options.bounceTime)) {
        this.isInTransition = false;
        this._execEvent("scrollEnd");
      }
    },

    _start: function (e) {
      // React to left mouse button only
      if (utils.eventType[e.type] != 1) {
        // for button property
        // http://unixpapa.com/js/mouse.html
        var button;
        if (!e.which) {
          /* IE case */
          button = e.button < 2 ? 0 : e.button == 4 ? 1 : 2;
        } else {
          /* All others */
          button = e.button;
        }
        if (button !== 0) {
          return;
        }
      }

      if (
        !this.enabled ||
        (this.initiated && utils.eventType[e.type] !== this.initiated)
      ) {
        return;
      }

      if (
        this.options.preventDefault &&
        !utils.isBadAndroid &&
        !utils.preventDefaultException(
          e.target,
          this.options.preventDefaultException
        )
      ) {
        e.preventDefault();
      }

      var point = e.touches ? e.touches[0] : e,
        pos;

      this.initiated = utils.eventType[e.type];
      this.moved = false;
      this.distX = 0;
      this.distY = 0;
      this.directionX = 0;
      this.directionY = 0;
      this.directionLocked = 0;

      this.startTime = utils.getTime();

      if (this.options.useTransition && this.isInTransition) {
        this._transitionTime();
        this.isInTransition = false;
        pos = this.getComputedPosition();
        this._translate(Math.round(pos.x), Math.round(pos.y));
        this._execEvent("scrollEnd");
      } else if (!this.options.useTransition && this.isAnimating) {
        this.isAnimating = false;
        this._execEvent("scrollEnd");
      }

      this.startX = this.x;
      this.startY = this.y;
      this.absStartX = this.x;
      this.absStartY = this.y;
      this.pointX = point.pageX;
      this.pointY = point.pageY;

      this._execEvent("beforeScrollStart");
    },

    _move: function (e) {
      if (!this.enabled || utils.eventType[e.type] !== this.initiated) {
        return;
      }

      if (this.options.preventDefault) {
        // increases performance on Android? TODO: check!
        e.preventDefault();
      }

      var point = e.touches ? e.touches[0] : e,
        deltaX = point.pageX - this.pointX,
        deltaY = point.pageY - this.pointY,
        timestamp = utils.getTime(),
        newX,
        newY,
        absDistX,
        absDistY;

      this.pointX = point.pageX;
      this.pointY = point.pageY;

      this.distX += deltaX;
      this.distY += deltaY;
      absDistX = Math.abs(this.distX);
      absDistY = Math.abs(this.distY);

      // We need to move at least 10 pixels for the scrolling to initiate
      if (timestamp - this.endTime > 300 && absDistX < 10 && absDistY < 10) {
        return;
      }

      // If you are scrolling in one direction lock the other
      if (!this.directionLocked && !this.options.freeScroll) {
        if (absDistX > absDistY + this.options.directionLockThreshold) {
          this.directionLocked = "h"; // lock horizontally
        } else if (absDistY >= absDistX + this.options.directionLockThreshold) {
          this.directionLocked = "v"; // lock vertically
        } else {
          this.directionLocked = "n"; // no lock
        }
      }

      if (this.directionLocked == "h") {
        if (this.options.eventPassthrough == "vertical") {
          e.preventDefault();
        } else if (this.options.eventPassthrough == "horizontal") {
          this.initiated = false;
          return;
        }

        deltaY = 0;
      } else if (this.directionLocked == "v") {
        if (this.options.eventPassthrough == "horizontal") {
          e.preventDefault();
        } else if (this.options.eventPassthrough == "vertical") {
          this.initiated = false;
          return;
        }

        deltaX = 0;
      }

      deltaX = this.hasHorizontalScroll ? deltaX : 0;
      deltaY = this.hasVerticalScroll ? deltaY : 0;

      newX = this.x + deltaX;
      newY = this.y + deltaY;

      // Slow down if outside of the boundaries
      if (newX > 0 || newX < this.maxScrollX) {
        newX = this.options.bounce
          ? this.x + deltaX / 3
          : newX > 0
          ? 0
          : this.maxScrollX;
      }
      if (newY > 0 || newY < this.maxScrollY) {
        newY = this.options.bounce
          ? this.y + deltaY / 3
          : newY > 0
          ? 0
          : this.maxScrollY;
      }

      this.directionX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
      this.directionY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;

      if (!this.moved) {
        this._execEvent("scrollStart");
      }

      this.moved = true;

      this._translate(newX, newY);

      /* REPLACE START: _move */

      if (timestamp - this.startTime > 300) {
        this.startTime = timestamp;
        this.startX = this.x;
        this.startY = this.y;
      }

      /* REPLACE END: _move */
    },

    _end: function (e) {
      if (!this.enabled || utils.eventType[e.type] !== this.initiated) {
        return;
      }

      if (
        this.options.preventDefault &&
        !utils.preventDefaultException(
          e.target,
          this.options.preventDefaultException
        )
      ) {
        e.preventDefault();
      }

      var point = e.changedTouches ? e.changedTouches[0] : e,
        momentumX,
        momentumY,
        duration = utils.getTime() - this.startTime,
        newX = Math.round(this.x),
        newY = Math.round(this.y),
        distanceX = Math.abs(newX - this.startX),
        distanceY = Math.abs(newY - this.startY),
        time = 0,
        easing = "";

      this.isInTransition = 0;
      this.initiated = 0;
      this.endTime = utils.getTime();

      // reset if we are outside of the boundaries
      if (this.resetPosition(this.options.bounceTime)) {
        return;
      }

      this.scrollTo(newX, newY); // ensures that the last position is rounded

      // we scrolled less than 10 pixels
      if (!this.moved) {
        if (this.options.tap) {
          utils.tap(e, this.options.tap);
        }

        if (this.options.click) {
          utils.click(e);
        }

        this._execEvent("scrollCancel");
        return;
      }

      if (
        this._events.flick &&
        duration < 200 &&
        distanceX < 100 &&
        distanceY < 100
      ) {
        this._execEvent("flick");
        return;
      }

      // start momentum animation if needed
      if (this.options.momentum && duration < 300) {
        momentumX = this.hasHorizontalScroll
          ? utils.momentum(
              this.x,
              this.startX,
              duration,
              this.maxScrollX,
              this.options.bounce ? this.wrapperWidth : 0,
              this.options.deceleration
            )
          : { destination: newX, duration: 0 };
        momentumY = this.hasVerticalScroll
          ? utils.momentum(
              this.y,
              this.startY,
              duration,
              this.maxScrollY,
              this.options.bounce ? this.wrapperHeight : 0,
              this.options.deceleration
            )
          : { destination: newY, duration: 0 };
        newX = momentumX.destination;
        newY = momentumY.destination;
        time = Math.max(momentumX.duration, momentumY.duration);
        this.isInTransition = 1;
      }

      if (this.options.snap) {
        var snap = this._nearestSnap(newX, newY);
        this.currentPage = snap;
        time =
          this.options.snapSpeed ||
          Math.max(
            Math.max(
              Math.min(Math.abs(newX - snap.x), 1000),
              Math.min(Math.abs(newY - snap.y), 1000)
            ),
            300
          );
        newX = snap.x;
        newY = snap.y;

        this.directionX = 0;
        this.directionY = 0;
        easing = this.options.bounceEasing;
      }

      // INSERT POINT: _end

      if (newX != this.x || newY != this.y) {
        // change easing function when scroller goes out of the boundaries
        if (
          newX > 0 ||
          newX < this.maxScrollX ||
          newY > 0 ||
          newY < this.maxScrollY
        ) {
          easing = utils.ease.quadratic;
        }

        this.scrollTo(newX, newY, time, easing);
        return;
      }

      this._execEvent("scrollEnd");
    },

    _resize: function () {
      var that = this;

      clearTimeout(this.resizeTimeout);

      this.resizeTimeout = setTimeout(function () {
        that.refresh();
      }, this.options.resizePolling);
    },

    resetPosition: function (time) {
      var x = this.x,
        y = this.y;

      time = time || 0;

      if (!this.hasHorizontalScroll || this.x > 0) {
        x = 0;
      } else if (this.x < this.maxScrollX) {
        x = this.maxScrollX;
      }

      if (!this.hasVerticalScroll || this.y > 0) {
        y = 0;
      } else if (this.y < this.maxScrollY) {
        y = this.maxScrollY;
      }

      if (x == this.x && y == this.y) {
        return false;
      }

      this.scrollTo(x, y, time, this.options.bounceEasing);

      return true;
    },

    disable: function () {
      this.enabled = false;
    },

    enable: function () {
      this.enabled = true;
    },

    refresh: function () {
      utils.getRect(this.wrapper); // Force reflow

      this.wrapperWidth = this.wrapper.clientWidth;
      this.wrapperHeight = this.wrapper.clientHeight;

      var rect = utils.getRect(this.scroller);
      /* REPLACE START: refresh */

      this.scrollerWidth = rect.width;
      this.scrollerHeight = rect.height;

      this.maxScrollX = this.wrapperWidth - this.scrollerWidth;
      this.maxScrollY = this.wrapperHeight - this.scrollerHeight;

      /* REPLACE END: refresh */

      this.hasHorizontalScroll = this.options.scrollX && this.maxScrollX < 0;
      this.hasVerticalScroll = this.options.scrollY && this.maxScrollY < 0;

      if (!this.hasHorizontalScroll) {
        this.maxScrollX = 0;
        this.scrollerWidth = this.wrapperWidth;
      }

      if (!this.hasVerticalScroll) {
        this.maxScrollY = 0;
        this.scrollerHeight = this.wrapperHeight;
      }

      this.endTime = 0;
      this.directionX = 0;
      this.directionY = 0;

      if (utils.hasPointer && !this.options.disablePointer) {
        // The wrapper should have `touchAction` property for using pointerEvent.
        this.wrapper.style[utils.style.touchAction] = utils.getTouchAction(
          this.options.eventPassthrough,
          true
        );

        // case. not support 'pinch-zoom'
        // https://github.com/cubiq/iscroll/issues/1118#issuecomment-270057583
        if (!this.wrapper.style[utils.style.touchAction]) {
          this.wrapper.style[utils.style.touchAction] = utils.getTouchAction(
            this.options.eventPassthrough,
            false
          );
        }
      }
      this.wrapperOffset = utils.offset(this.wrapper);

      this._execEvent("refresh");

      this.resetPosition();

      // INSERT POINT: _refresh
    },

    on: function (type, fn) {
      if (!this._events[type]) {
        this._events[type] = [];
      }

      this._events[type].push(fn);
    },

    off: function (type, fn) {
      if (!this._events[type]) {
        return;
      }

      var index = this._events[type].indexOf(fn);

      if (index > -1) {
        this._events[type].splice(index, 1);
      }
    },

    _execEvent: function (type) {
      if (!this._events[type]) {
        return;
      }

      var i = 0,
        l = this._events[type].length;

      if (!l) {
        return;
      }

      for (; i < l; i++) {
        this._events[type][i].apply(this, [].slice.call(arguments, 1));
      }
    },

    scrollBy: function (x, y, time, easing) {
      x = this.x + x;
      y = this.y + y;
      time = time || 0;

      this.scrollTo(x, y, time, easing);
    },

    scrollTo: function (x, y, time, easing) {
      easing = easing || utils.ease.circular;

      this.isInTransition = this.options.useTransition && time > 0;
      var transitionType = this.options.useTransition && easing.style;
      if (!time || transitionType) {
        if (transitionType) {
          this._transitionTimingFunction(easing.style);
          this._transitionTime(time);
        }
        this._translate(x, y);
      } else {
        this._animate(x, y, time, easing.fn);
      }
    },

    scrollToElement: function (el, time, offsetX, offsetY, easing) {
      el = el.nodeType ? el : this.scroller.querySelector(el);

      if (!el) {
        return;
      }

      var pos = utils.offset(el);

      pos.left -= this.wrapperOffset.left;
      pos.top -= this.wrapperOffset.top;

      // if offsetX/Y are true we center the element to the screen
      var elRect = utils.getRect(el);
      var wrapperRect = utils.getRect(this.wrapper);
      if (offsetX === true) {
        offsetX = Math.round(elRect.width / 2 - wrapperRect.width / 2);
      }
      if (offsetY === true) {
        offsetY = Math.round(elRect.height / 2 - wrapperRect.height / 2);
      }

      pos.left -= offsetX || 0;
      pos.top -= offsetY || 0;

      pos.left =
        pos.left > 0
          ? 0
          : pos.left < this.maxScrollX
          ? this.maxScrollX
          : pos.left;
      pos.top =
        pos.top > 0 ? 0 : pos.top < this.maxScrollY ? this.maxScrollY : pos.top;

      time =
        time === undefined || time === null || time === "auto"
          ? Math.max(Math.abs(this.x - pos.left), Math.abs(this.y - pos.top))
          : time;

      this.scrollTo(pos.left, pos.top, time, easing);
    },

    _transitionTime: function (time) {
      if (!this.options.useTransition) {
        return;
      }
      time = time || 0;
      var durationProp = utils.style.transitionDuration;
      if (!durationProp) {
        return;
      }

      this.scrollerStyle[durationProp] = time + "ms";

      if (!time && utils.isBadAndroid) {
        this.scrollerStyle[durationProp] = "0.0001ms";
        // remove 0.0001ms
        var self = this;
        rAF(function () {
          if (self.scrollerStyle[durationProp] === "0.0001ms") {
            self.scrollerStyle[durationProp] = "0s";
          }
        });
      }

      if (this.indicators) {
        for (var i = this.indicators.length; i--; ) {
          this.indicators[i].transitionTime(time);
        }
      }

      // INSERT POINT: _transitionTime
    },

    _transitionTimingFunction: function (easing) {
      this.scrollerStyle[utils.style.transitionTimingFunction] = easing;

      if (this.indicators) {
        for (var i = this.indicators.length; i--; ) {
          this.indicators[i].transitionTimingFunction(easing);
        }
      }

      // INSERT POINT: _transitionTimingFunction
    },

    _translate: function (x, y) {
      if (this.options.useTransform) {
        /* REPLACE START: _translate */

        this.scrollerStyle[utils.style.transform] =
          "translate(" + x + "px," + y + "px)" + this.translateZ;

        /* REPLACE END: _translate */
      } else {
        x = Math.round(x);
        y = Math.round(y);
        this.scrollerStyle.left = x + "px";
        this.scrollerStyle.top = y + "px";
      }

      this.x = x;
      this.y = y;

      if (this.indicators) {
        for (var i = this.indicators.length; i--; ) {
          this.indicators[i].updatePosition();
        }
      }

      // INSERT POINT: _translate
    },

    _initEvents: function (remove) {
      var eventType = remove ? utils.removeEvent : utils.addEvent,
        target = this.options.bindToWrapper ? this.wrapper : window;

      eventType(window, "orientationchange", this);
      eventType(window, "resize", this);

      if (this.options.click) {
        eventType(this.wrapper, "click", this, true);
      }

      if (!this.options.disableMouse) {
        eventType(this.wrapper, "mousedown", this);
        eventType(target, "mousemove", this);
        eventType(target, "mousecancel", this);
        eventType(target, "mouseup", this);
      }

      if (utils.hasPointer && !this.options.disablePointer) {
        eventType(this.wrapper, utils.prefixPointerEvent("pointerdown"), this);
        eventType(target, utils.prefixPointerEvent("pointermove"), this);
        eventType(target, utils.prefixPointerEvent("pointercancel"), this);
        eventType(target, utils.prefixPointerEvent("pointerup"), this);
      }

      if (utils.hasTouch && !this.options.disableTouch) {
        eventType(this.wrapper, "touchstart", this);
        eventType(target, "touchmove", this);
        eventType(target, "touchcancel", this);
        eventType(target, "touchend", this);
      }

      eventType(this.scroller, "transitionend", this);
      eventType(this.scroller, "webkitTransitionEnd", this);
      eventType(this.scroller, "oTransitionEnd", this);
      eventType(this.scroller, "MSTransitionEnd", this);
    },

    getComputedPosition: function () {
      var matrix = window.getComputedStyle(this.scroller, null),
        x,
        y;

      if (this.options.useTransform) {
        matrix = matrix[utils.style.transform].split(")")[0].split(", ");
        x = +(matrix[12] || matrix[4]);
        y = +(matrix[13] || matrix[5]);
      } else {
        x = +matrix.left.replace(/[^-\d.]/g, "");
        y = +matrix.top.replace(/[^-\d.]/g, "");
      }

      return { x: x, y: y };
    },
    _initIndicators: function () {
      var interactive = this.options.interactiveScrollbars,
        customStyle = typeof this.options.scrollbars != "string",
        indicators = [],
        indicator;

      var that = this;

      this.indicators = [];

      if (this.options.scrollbars) {
        // Vertical scrollbar
        if (this.options.scrollY) {
          indicator = {
            el: createDefaultScrollbar(
              "v",
              interactive,
              this.options.scrollbars
            ),
            interactive: interactive,
            defaultScrollbars: true,
            customStyle: customStyle,
            resize: this.options.resizeScrollbars,
            shrink: this.options.shrinkScrollbars,
            fade: this.options.fadeScrollbars,
            listenX: false,
          };

          this.wrapper.appendChild(indicator.el);
          indicators.push(indicator);
        }

        // Horizontal scrollbar
        if (this.options.scrollX) {
          indicator = {
            el: createDefaultScrollbar(
              "h",
              interactive,
              this.options.scrollbars
            ),
            interactive: interactive,
            defaultScrollbars: true,
            customStyle: customStyle,
            resize: this.options.resizeScrollbars,
            shrink: this.options.shrinkScrollbars,
            fade: this.options.fadeScrollbars,
            listenY: false,
          };

          this.wrapper.appendChild(indicator.el);
          indicators.push(indicator);
        }
      }

      if (this.options.indicators) {
        // TODO: check concat compatibility
        indicators = indicators.concat(this.options.indicators);
      }

      for (var i = indicators.length; i--; ) {
        this.indicators.push(new Indicator(this, indicators[i]));
      }

      // TODO: check if we can use array.map (wide compatibility and performance issues)
      function _indicatorsMap(fn) {
        if (that.indicators) {
          for (var i = that.indicators.length; i--; ) {
            fn.call(that.indicators[i]);
          }
        }
      }

      if (this.options.fadeScrollbars) {
        this.on("scrollEnd", function () {
          _indicatorsMap(function () {
            this.fade();
          });
        });

        this.on("scrollCancel", function () {
          _indicatorsMap(function () {
            this.fade();
          });
        });

        this.on("scrollStart", function () {
          _indicatorsMap(function () {
            this.fade(1);
          });
        });

        this.on("beforeScrollStart", function () {
          _indicatorsMap(function () {
            this.fade(1, true);
          });
        });
      }

      this.on("refresh", function () {
        _indicatorsMap(function () {
          this.refresh();
        });
      });

      this.on("destroy", function () {
        _indicatorsMap(function () {
          this.destroy();
        });

        delete this.indicators;
      });
    },

    _initWheel: function () {
      utils.addEvent(this.wrapper, "wheel", this);
      utils.addEvent(this.wrapper, "mousewheel", this);
      utils.addEvent(this.wrapper, "DOMMouseScroll", this);

      this.on("destroy", function () {
        clearTimeout(this.wheelTimeout);
        this.wheelTimeout = null;
        utils.removeEvent(this.wrapper, "wheel", this);
        utils.removeEvent(this.wrapper, "mousewheel", this);
        utils.removeEvent(this.wrapper, "DOMMouseScroll", this);
      });
    },

    _wheel: function (e) {
      if (!this.enabled) {
        return;
      }

      e.preventDefault();

      var wheelDeltaX,
        wheelDeltaY,
        newX,
        newY,
        that = this;

      if (this.wheelTimeout === undefined) {
        that._execEvent("scrollStart");
      }

      // Execute the scrollEnd event after 400ms the wheel stopped scrolling
      clearTimeout(this.wheelTimeout);
      this.wheelTimeout = setTimeout(function () {
        if (!that.options.snap) {
          that._execEvent("scrollEnd");
        }
        that.wheelTimeout = undefined;
      }, 400);

      if ("deltaX" in e) {
        if (e.deltaMode === 1) {
          wheelDeltaX = -e.deltaX * this.options.mouseWheelSpeed;
          wheelDeltaY = -e.deltaY * this.options.mouseWheelSpeed;
        } else {
          wheelDeltaX = -e.deltaX;
          wheelDeltaY = -e.deltaY;
        }
      } else if ("wheelDeltaX" in e) {
        wheelDeltaX = (e.wheelDeltaX / 120) * this.options.mouseWheelSpeed;
        wheelDeltaY = (e.wheelDeltaY / 120) * this.options.mouseWheelSpeed;
      } else if ("wheelDelta" in e) {
        wheelDeltaX = wheelDeltaY =
          (e.wheelDelta / 120) * this.options.mouseWheelSpeed;
      } else if ("detail" in e) {
        wheelDeltaX = wheelDeltaY =
          (-e.detail / 3) * this.options.mouseWheelSpeed;
      } else {
        return;
      }

      wheelDeltaX *= this.options.invertWheelDirection;
      wheelDeltaY *= this.options.invertWheelDirection;

      if (!this.hasVerticalScroll) {
        wheelDeltaX = wheelDeltaY;
        wheelDeltaY = 0;
      }

      if (this.options.snap) {
        newX = this.currentPage.pageX;
        newY = this.currentPage.pageY;

        if (wheelDeltaX > 0) {
          newX--;
        } else if (wheelDeltaX < 0) {
          newX++;
        }

        if (wheelDeltaY > 0) {
          newY--;
        } else if (wheelDeltaY < 0) {
          newY++;
        }

        this.goToPage(newX, newY);

        return;
      }

      newX = this.x + Math.round(this.hasHorizontalScroll ? wheelDeltaX : 0);
      newY = this.y + Math.round(this.hasVerticalScroll ? wheelDeltaY : 0);

      this.directionX = wheelDeltaX > 0 ? -1 : wheelDeltaX < 0 ? 1 : 0;
      this.directionY = wheelDeltaY > 0 ? -1 : wheelDeltaY < 0 ? 1 : 0;

      if (newX > 0) {
        newX = 0;
      } else if (newX < this.maxScrollX) {
        newX = this.maxScrollX;
      }

      if (newY > 0) {
        newY = 0;
      } else if (newY < this.maxScrollY) {
        newY = this.maxScrollY;
      }

      this.scrollTo(newX, newY, 0);

      // INSERT POINT: _wheel
    },

    _initSnap: function () {
      this.currentPage = {};

      if (typeof this.options.snap == "string") {
        this.options.snap = this.scroller.querySelectorAll(this.options.snap);
      }

      this.on("refresh", function () {
        var i = 0,
          l,
          m = 0,
          n,
          cx,
          cy,
          x = 0,
          y,
          stepX = this.options.snapStepX || this.wrapperWidth,
          stepY = this.options.snapStepY || this.wrapperHeight,
          el,
          rect;

        this.pages = [];

        if (
          !this.wrapperWidth ||
          !this.wrapperHeight ||
          !this.scrollerWidth ||
          !this.scrollerHeight
        ) {
          return;
        }

        if (this.options.snap === true) {
          cx = Math.round(stepX / 2);
          cy = Math.round(stepY / 2);

          while (x > -this.scrollerWidth) {
            this.pages[i] = [];
            l = 0;
            y = 0;

            while (y > -this.scrollerHeight) {
              this.pages[i][l] = {
                x: Math.max(x, this.maxScrollX),
                y: Math.max(y, this.maxScrollY),
                width: stepX,
                height: stepY,
                cx: x - cx,
                cy: y - cy,
              };

              y -= stepY;
              l++;
            }

            x -= stepX;
            i++;
          }
        } else {
          el = this.options.snap;
          l = el.length;
          n = -1;

          for (; i < l; i++) {
            rect = utils.getRect(el[i]);
            if (i === 0 || rect.left <= utils.getRect(el[i - 1]).left) {
              m = 0;
              n++;
            }

            if (!this.pages[m]) {
              this.pages[m] = [];
            }

            x = Math.max(-rect.left, this.maxScrollX);
            y = Math.max(-rect.top, this.maxScrollY);
            cx = x - Math.round(rect.width / 2);
            cy = y - Math.round(rect.height / 2);

            this.pages[m][n] = {
              x: x,
              y: y,
              width: rect.width,
              height: rect.height,
              cx: cx,
              cy: cy,
            };

            if (x > this.maxScrollX) {
              m++;
            }
          }
        }

        this.goToPage(
          this.currentPage.pageX || 0,
          this.currentPage.pageY || 0,
          0
        );

        // Update snap threshold if needed
        if (this.options.snapThreshold % 1 === 0) {
          this.snapThresholdX = this.options.snapThreshold;
          this.snapThresholdY = this.options.snapThreshold;
        } else {
          this.snapThresholdX = Math.round(
            this.pages[this.currentPage.pageX][this.currentPage.pageY].width *
              this.options.snapThreshold
          );
          this.snapThresholdY = Math.round(
            this.pages[this.currentPage.pageX][this.currentPage.pageY].height *
              this.options.snapThreshold
          );
        }
      });

      this.on("flick", function () {
        var time =
          this.options.snapSpeed ||
          Math.max(
            Math.max(
              Math.min(Math.abs(this.x - this.startX), 1000),
              Math.min(Math.abs(this.y - this.startY), 1000)
            ),
            300
          );

        this.goToPage(
          this.currentPage.pageX + this.directionX,
          this.currentPage.pageY + this.directionY,
          time
        );
      });
    },

    _nearestSnap: function (x, y) {
      if (!this.pages.length) {
        return { x: 0, y: 0, pageX: 0, pageY: 0 };
      }

      var i = 0,
        l = this.pages.length,
        m = 0;

      // Check if we exceeded the snap threshold
      if (
        Math.abs(x - this.absStartX) < this.snapThresholdX &&
        Math.abs(y - this.absStartY) < this.snapThresholdY
      ) {
        return this.currentPage;
      }

      if (x > 0) {
        x = 0;
      } else if (x < this.maxScrollX) {
        x = this.maxScrollX;
      }

      if (y > 0) {
        y = 0;
      } else if (y < this.maxScrollY) {
        y = this.maxScrollY;
      }

      for (; i < l; i++) {
        if (x >= this.pages[i][0].cx) {
          x = this.pages[i][0].x;
          break;
        }
      }

      l = this.pages[i].length;

      for (; m < l; m++) {
        if (y >= this.pages[0][m].cy) {
          y = this.pages[0][m].y;
          break;
        }
      }

      if (i == this.currentPage.pageX) {
        i += this.directionX;

        if (i < 0) {
          i = 0;
        } else if (i >= this.pages.length) {
          i = this.pages.length - 1;
        }

        x = this.pages[i][0].x;
      }

      if (m == this.currentPage.pageY) {
        m += this.directionY;

        if (m < 0) {
          m = 0;
        } else if (m >= this.pages[0].length) {
          m = this.pages[0].length - 1;
        }

        y = this.pages[0][m].y;
      }

      return {
        x: x,
        y: y,
        pageX: i,
        pageY: m,
      };
    },

    goToPage: function (x, y, time, easing) {
      easing = easing || this.options.bounceEasing;

      if (x >= this.pages.length) {
        x = this.pages.length - 1;
      } else if (x < 0) {
        x = 0;
      }

      if (y >= this.pages[x].length) {
        y = this.pages[x].length - 1;
      } else if (y < 0) {
        y = 0;
      }

      var posX = this.pages[x][y].x,
        posY = this.pages[x][y].y;

      time =
        time === undefined
          ? this.options.snapSpeed ||
            Math.max(
              Math.max(
                Math.min(Math.abs(posX - this.x), 1000),
                Math.min(Math.abs(posY - this.y), 1000)
              ),
              300
            )
          : time;

      this.currentPage = {
        x: posX,
        y: posY,
        pageX: x,
        pageY: y,
      };

      this.scrollTo(posX, posY, time, easing);
    },

    next: function (time, easing) {
      var x = this.currentPage.pageX,
        y = this.currentPage.pageY;

      x++;

      if (x >= this.pages.length && this.hasVerticalScroll) {
        x = 0;
        y++;
      }

      this.goToPage(x, y, time, easing);
    },

    prev: function (time, easing) {
      var x = this.currentPage.pageX,
        y = this.currentPage.pageY;

      x--;

      if (x < 0 && this.hasVerticalScroll) {
        x = 0;
        y--;
      }

      this.goToPage(x, y, time, easing);
    },

    _initKeys: function (e) {
      // default key bindings
      var keys = {
        pageUp: 33,
        pageDown: 34,
        end: 35,
        home: 36,
        left: 37,
        up: 38,
        right: 39,
        down: 40,
      };
      var i;

      // if you give me characters I give you keycode
      if (typeof this.options.keyBindings == "object") {
        for (i in this.options.keyBindings) {
          if (typeof this.options.keyBindings[i] == "string") {
            this.options.keyBindings[i] = this.options.keyBindings[i]
              .toUpperCase()
              .charCodeAt(0);
          }
        }
      } else {
        this.options.keyBindings = {};
      }

      for (i in keys) {
        this.options.keyBindings[i] = this.options.keyBindings[i] || keys[i];
      }

      utils.addEvent(window, "keydown", this);

      this.on("destroy", function () {
        utils.removeEvent(window, "keydown", this);
      });
    },

    _key: function (e) {
      if (!this.enabled) {
        return;
      }

      var snap = this.options.snap, // we are using this alot, better to cache it
        newX = snap ? this.currentPage.pageX : this.x,
        newY = snap ? this.currentPage.pageY : this.y,
        now = utils.getTime(),
        prevTime = this.keyTime || 0,
        acceleration = 0.25,
        pos;

      if (this.options.useTransition && this.isInTransition) {
        pos = this.getComputedPosition();

        this._translate(Math.round(pos.x), Math.round(pos.y));
        this.isInTransition = false;
      }

      this.keyAcceleration =
        now - prevTime < 200
          ? Math.min(this.keyAcceleration + acceleration, 50)
          : 0;

      switch (e.keyCode) {
        case this.options.keyBindings.pageUp:
          if (this.hasHorizontalScroll && !this.hasVerticalScroll) {
            newX += snap ? 1 : this.wrapperWidth;
          } else {
            newY += snap ? 1 : this.wrapperHeight;
          }
          break;
        case this.options.keyBindings.pageDown:
          if (this.hasHorizontalScroll && !this.hasVerticalScroll) {
            newX -= snap ? 1 : this.wrapperWidth;
          } else {
            newY -= snap ? 1 : this.wrapperHeight;
          }
          break;
        case this.options.keyBindings.end:
          newX = snap ? this.pages.length - 1 : this.maxScrollX;
          newY = snap ? this.pages[0].length - 1 : this.maxScrollY;
          break;
        case this.options.keyBindings.home:
          newX = 0;
          newY = 0;
          break;
        case this.options.keyBindings.left:
          newX += snap ? -1 : (5 + this.keyAcceleration) >> 0;
          break;
        case this.options.keyBindings.up:
          newY += snap ? 1 : (5 + this.keyAcceleration) >> 0;
          break;
        case this.options.keyBindings.right:
          newX -= snap ? -1 : (5 + this.keyAcceleration) >> 0;
          break;
        case this.options.keyBindings.down:
          newY -= snap ? 1 : (5 + this.keyAcceleration) >> 0;
          break;
        default:
          return;
      }

      if (snap) {
        this.goToPage(newX, newY);
        return;
      }

      if (newX > 0) {
        newX = 0;
        this.keyAcceleration = 0;
      } else if (newX < this.maxScrollX) {
        newX = this.maxScrollX;
        this.keyAcceleration = 0;
      }

      if (newY > 0) {
        newY = 0;
        this.keyAcceleration = 0;
      } else if (newY < this.maxScrollY) {
        newY = this.maxScrollY;
        this.keyAcceleration = 0;
      }

      this.scrollTo(newX, newY, 0);

      this.keyTime = now;
    },

    _animate: function (destX, destY, duration, easingFn) {
      var that = this,
        startX = this.x,
        startY = this.y,
        startTime = utils.getTime(),
        destTime = startTime + duration;

      function step() {
        var now = utils.getTime(),
          newX,
          newY,
          easing;

        if (now >= destTime) {
          that.isAnimating = false;
          that._translate(destX, destY);

          if (!that.resetPosition(that.options.bounceTime)) {
            that._execEvent("scrollEnd");
          }

          return;
        }

        now = (now - startTime) / duration;
        easing = easingFn(now);
        newX = (destX - startX) * easing + startX;
        newY = (destY - startY) * easing + startY;
        that._translate(newX, newY);

        if (that.isAnimating) {
          rAF(step);
        }
      }

      this.isAnimating = true;
      step();
    },
    handleEvent: function (e) {
      switch (e.type) {
        case "touchstart":
        case "pointerdown":
        case "MSPointerDown":
        case "mousedown":
          this._start(e);
          break;
        case "touchmove":
        case "pointermove":
        case "MSPointerMove":
        case "mousemove":
          this._move(e);
          break;
        case "touchend":
        case "pointerup":
        case "MSPointerUp":
        case "mouseup":
        case "touchcancel":
        case "pointercancel":
        case "MSPointerCancel":
        case "mousecancel":
          this._end(e);
          break;
        case "orientationchange":
        case "resize":
          this._resize();
          break;
        case "transitionend":
        case "webkitTransitionEnd":
        case "oTransitionEnd":
        case "MSTransitionEnd":
          this._transitionEnd(e);
          break;
        case "wheel":
        case "DOMMouseScroll":
        case "mousewheel":
          this._wheel(e);
          break;
        case "keydown":
          this._key(e);
          break;
        case "click":
          if (this.enabled && !e._constructed) {
            e.preventDefault();
            e.stopPropagation();
          }
          break;
      }
    },
  };
  function createDefaultScrollbar(direction, interactive, type) {
    var scrollbar = document.createElement("div"),
      indicator = document.createElement("div");

    if (type === true) {
      scrollbar.style.cssText = "position:absolute;z-index:9999";
      indicator.style.cssText =
        "-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;position:absolute;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);border-radius:3px";
    }

    indicator.className = "iScrollIndicator";

    if (direction == "h") {
      if (type === true) {
        scrollbar.style.cssText += ";height:7px;left:2px;right:2px;bottom:0";
        indicator.style.height = "100%";
      }
      scrollbar.className = "iScrollHorizontalScrollbar";
    } else {
      if (type === true) {
        scrollbar.style.cssText += ";width:7px;bottom:2px;top:2px;right:1px";
        indicator.style.width = "100%";
      }
      scrollbar.className = "iScrollVerticalScrollbar";
    }

    scrollbar.style.cssText += ";overflow:hidden";

    if (!interactive) {
      scrollbar.style.pointerEvents = "none";
    }

    scrollbar.appendChild(indicator);

    return scrollbar;
  }

  function Indicator(scroller, options) {
    this.wrapper =
      typeof options.el == "string"
        ? document.querySelector(options.el)
        : options.el;
    this.wrapperStyle = this.wrapper.style;
    this.indicator = this.wrapper.children[0];
    this.indicatorStyle = this.indicator.style;
    this.scroller = scroller;

    this.options = {
      listenX: true,
      listenY: true,
      interactive: false,
      resize: true,
      defaultScrollbars: false,
      shrink: false,
      fade: false,
      speedRatioX: 0,
      speedRatioY: 0,
    };

    for (var i in options) {
      this.options[i] = options[i];
    }

    this.sizeRatioX = 1;
    this.sizeRatioY = 1;
    this.maxPosX = 0;
    this.maxPosY = 0;

    if (this.options.interactive) {
      if (!this.options.disableTouch) {
        utils.addEvent(this.indicator, "touchstart", this);
        utils.addEvent(window, "touchend", this);
      }
      if (!this.options.disablePointer) {
        utils.addEvent(
          this.indicator,
          utils.prefixPointerEvent("pointerdown"),
          this
        );
        utils.addEvent(window, utils.prefixPointerEvent("pointerup"), this);
      }
      if (!this.options.disableMouse) {
        utils.addEvent(this.indicator, "mousedown", this);
        utils.addEvent(window, "mouseup", this);
      }
    }

    if (this.options.fade) {
      this.wrapperStyle[utils.style.transform] = this.scroller.translateZ;
      var durationProp = utils.style.transitionDuration;
      if (!durationProp) {
        return;
      }
      this.wrapperStyle[durationProp] = utils.isBadAndroid ? "0.0001ms" : "0ms";
      // remove 0.0001ms
      var self = this;
      if (utils.isBadAndroid) {
        rAF(function () {
          if (self.wrapperStyle[durationProp] === "0.0001ms") {
            self.wrapperStyle[durationProp] = "0s";
          }
        });
      }
      this.wrapperStyle.opacity = "0";
    }
  }

  Indicator.prototype = {
    handleEvent: function (e) {
      switch (e.type) {
        case "touchstart":
        case "pointerdown":
        case "MSPointerDown":
        case "mousedown":
          this._start(e);
          break;
        case "touchmove":
        case "pointermove":
        case "MSPointerMove":
        case "mousemove":
          this._move(e);
          break;
        case "touchend":
        case "pointerup":
        case "MSPointerUp":
        case "mouseup":
        case "touchcancel":
        case "pointercancel":
        case "MSPointerCancel":
        case "mousecancel":
          this._end(e);
          break;
      }
    },

    destroy: function () {
      if (this.options.fadeScrollbars) {
        clearTimeout(this.fadeTimeout);
        this.fadeTimeout = null;
      }
      if (this.options.interactive) {
        utils.removeEvent(this.indicator, "touchstart", this);
        utils.removeEvent(
          this.indicator,
          utils.prefixPointerEvent("pointerdown"),
          this
        );
        utils.removeEvent(this.indicator, "mousedown", this);

        utils.removeEvent(window, "touchmove", this);
        utils.removeEvent(
          window,
          utils.prefixPointerEvent("pointermove"),
          this
        );
        utils.removeEvent(window, "mousemove", this);

        utils.removeEvent(window, "touchend", this);
        utils.removeEvent(window, utils.prefixPointerEvent("pointerup"), this);
        utils.removeEvent(window, "mouseup", this);
      }

      if (this.options.defaultScrollbars && this.wrapper.parentNode) {
        this.wrapper.parentNode.removeChild(this.wrapper);
      }
    },

    _start: function (e) {
      var point = e.touches ? e.touches[0] : e;

      e.preventDefault();
      e.stopPropagation();

      this.transitionTime();

      this.initiated = true;
      this.moved = false;
      this.lastPointX = point.pageX;
      this.lastPointY = point.pageY;

      this.startTime = utils.getTime();

      if (!this.options.disableTouch) {
        utils.addEvent(window, "touchmove", this);
      }
      if (!this.options.disablePointer) {
        utils.addEvent(window, utils.prefixPointerEvent("pointermove"), this);
      }
      if (!this.options.disableMouse) {
        utils.addEvent(window, "mousemove", this);
      }

      this.scroller._execEvent("beforeScrollStart");
    },

    _move: function (e) {
      var point = e.touches ? e.touches[0] : e,
        deltaX,
        deltaY,
        newX,
        newY,
        timestamp = utils.getTime();

      if (!this.moved) {
        this.scroller._execEvent("scrollStart");
      }

      this.moved = true;

      deltaX = point.pageX - this.lastPointX;
      this.lastPointX = point.pageX;

      deltaY = point.pageY - this.lastPointY;
      this.lastPointY = point.pageY;

      newX = this.x + deltaX;
      newY = this.y + deltaY;

      this._pos(newX, newY);

      // INSERT POINT: indicator._move

      e.preventDefault();
      e.stopPropagation();
    },

    _end: function (e) {
      if (!this.initiated) {
        return;
      }

      this.initiated = false;

      e.preventDefault();
      e.stopPropagation();

      utils.removeEvent(window, "touchmove", this);
      utils.removeEvent(window, utils.prefixPointerEvent("pointermove"), this);
      utils.removeEvent(window, "mousemove", this);

      if (this.scroller.options.snap) {
        var snap = this.scroller._nearestSnap(this.scroller.x, this.scroller.y);

        var time =
          this.options.snapSpeed ||
          Math.max(
            Math.max(
              Math.min(Math.abs(this.scroller.x - snap.x), 1000),
              Math.min(Math.abs(this.scroller.y - snap.y), 1000)
            ),
            300
          );

        if (this.scroller.x != snap.x || this.scroller.y != snap.y) {
          this.scroller.directionX = 0;
          this.scroller.directionY = 0;
          this.scroller.currentPage = snap;
          this.scroller.scrollTo(
            snap.x,
            snap.y,
            time,
            this.scroller.options.bounceEasing
          );
        }
      }

      if (this.moved) {
        this.scroller._execEvent("scrollEnd");
      }
    },

    transitionTime: function (time) {
      time = time || 0;
      var durationProp = utils.style.transitionDuration;
      if (!durationProp) {
        return;
      }

      this.indicatorStyle[durationProp] = time + "ms";

      if (!time && utils.isBadAndroid) {
        this.indicatorStyle[durationProp] = "0.0001ms";
        // remove 0.0001ms
        var self = this;
        rAF(function () {
          if (self.indicatorStyle[durationProp] === "0.0001ms") {
            self.indicatorStyle[durationProp] = "0s";
          }
        });
      }
    },

    transitionTimingFunction: function (easing) {
      this.indicatorStyle[utils.style.transitionTimingFunction] = easing;
    },

    refresh: function () {
      this.transitionTime();

      if (this.options.listenX && !this.options.listenY) {
        this.indicatorStyle.display = this.scroller.hasHorizontalScroll
          ? "block"
          : "none";
      } else if (this.options.listenY && !this.options.listenX) {
        this.indicatorStyle.display = this.scroller.hasVerticalScroll
          ? "block"
          : "none";
      } else {
        this.indicatorStyle.display =
          this.scroller.hasHorizontalScroll || this.scroller.hasVerticalScroll
            ? "block"
            : "none";
      }

      if (
        this.scroller.hasHorizontalScroll &&
        this.scroller.hasVerticalScroll
      ) {
        utils.addClass(this.wrapper, "iScrollBothScrollbars");
        utils.removeClass(this.wrapper, "iScrollLoneScrollbar");

        if (this.options.defaultScrollbars && this.options.customStyle) {
          if (this.options.listenX) {
            this.wrapper.style.right = "8px";
          } else {
            this.wrapper.style.bottom = "8px";
          }
        }
      } else {
        utils.removeClass(this.wrapper, "iScrollBothScrollbars");
        utils.addClass(this.wrapper, "iScrollLoneScrollbar");

        if (this.options.defaultScrollbars && this.options.customStyle) {
          if (this.options.listenX) {
            this.wrapper.style.right = "2px";
          } else {
            this.wrapper.style.bottom = "2px";
          }
        }
      }

      utils.getRect(this.wrapper); // force refresh

      if (this.options.listenX) {
        this.wrapperWidth = this.wrapper.clientWidth;
        if (this.options.resize) {
          this.indicatorWidth = Math.max(
            Math.round(
              (this.wrapperWidth * this.wrapperWidth) /
                (this.scroller.scrollerWidth || this.wrapperWidth || 1)
            ),
            8
          );
          this.indicatorStyle.width = this.indicatorWidth + "px";
        } else {
          this.indicatorWidth = this.indicator.clientWidth;
        }

        this.maxPosX = this.wrapperWidth - this.indicatorWidth;

        if (this.options.shrink == "clip") {
          this.minBoundaryX = -this.indicatorWidth + 8;
          this.maxBoundaryX = this.wrapperWidth - 8;
        } else {
          this.minBoundaryX = 0;
          this.maxBoundaryX = this.maxPosX;
        }

        this.sizeRatioX =
          this.options.speedRatioX ||
          (this.scroller.maxScrollX && this.maxPosX / this.scroller.maxScrollX);
      }

      if (this.options.listenY) {
        this.wrapperHeight = this.wrapper.clientHeight;
        if (this.options.resize) {
          this.indicatorHeight = Math.max(
            Math.round(
              (this.wrapperHeight * this.wrapperHeight) /
                (this.scroller.scrollerHeight || this.wrapperHeight || 1)
            ),
            8
          );
          this.indicatorStyle.height = this.indicatorHeight + "px";
        } else {
          this.indicatorHeight = this.indicator.clientHeight;
        }

        this.maxPosY = this.wrapperHeight - this.indicatorHeight;

        if (this.options.shrink == "clip") {
          this.minBoundaryY = -this.indicatorHeight + 8;
          this.maxBoundaryY = this.wrapperHeight - 8;
        } else {
          this.minBoundaryY = 0;
          this.maxBoundaryY = this.maxPosY;
        }

        this.maxPosY = this.wrapperHeight - this.indicatorHeight;
        this.sizeRatioY =
          this.options.speedRatioY ||
          (this.scroller.maxScrollY && this.maxPosY / this.scroller.maxScrollY);
      }

      this.updatePosition();
    },

    updatePosition: function () {
      var x =
          (this.options.listenX &&
            Math.round(this.sizeRatioX * this.scroller.x)) ||
          0,
        y =
          (this.options.listenY &&
            Math.round(this.sizeRatioY * this.scroller.y)) ||
          0;

      if (!this.options.ignoreBoundaries) {
        if (x < this.minBoundaryX) {
          if (this.options.shrink == "scale") {
            this.width = Math.max(this.indicatorWidth + x, 8);
            this.indicatorStyle.width = this.width + "px";
          }
          x = this.minBoundaryX;
        } else if (x > this.maxBoundaryX) {
          if (this.options.shrink == "scale") {
            this.width = Math.max(this.indicatorWidth - (x - this.maxPosX), 8);
            this.indicatorStyle.width = this.width + "px";
            x = this.maxPosX + this.indicatorWidth - this.width;
          } else {
            x = this.maxBoundaryX;
          }
        } else if (
          this.options.shrink == "scale" &&
          this.width != this.indicatorWidth
        ) {
          this.width = this.indicatorWidth;
          this.indicatorStyle.width = this.width + "px";
        }

        if (y < this.minBoundaryY) {
          if (this.options.shrink == "scale") {
            this.height = Math.max(this.indicatorHeight + y * 3, 8);
            this.indicatorStyle.height = this.height + "px";
          }
          y = this.minBoundaryY;
        } else if (y > this.maxBoundaryY) {
          if (this.options.shrink == "scale") {
            this.height = Math.max(
              this.indicatorHeight - (y - this.maxPosY) * 3,
              8
            );
            this.indicatorStyle.height = this.height + "px";
            y = this.maxPosY + this.indicatorHeight - this.height;
          } else {
            y = this.maxBoundaryY;
          }
        } else if (
          this.options.shrink == "scale" &&
          this.height != this.indicatorHeight
        ) {
          this.height = this.indicatorHeight;
          this.indicatorStyle.height = this.height + "px";
        }
      }

      this.x = x;
      this.y = y;

      if (this.scroller.options.useTransform) {
        this.indicatorStyle[utils.style.transform] =
          "translate(" + x + "px," + y + "px)" + this.scroller.translateZ;
      } else {
        this.indicatorStyle.left = x + "px";
        this.indicatorStyle.top = y + "px";
      }
    },

    _pos: function (x, y) {
      if (x < 0) {
        x = 0;
      } else if (x > this.maxPosX) {
        x = this.maxPosX;
      }

      if (y < 0) {
        y = 0;
      } else if (y > this.maxPosY) {
        y = this.maxPosY;
      }

      x = this.options.listenX
        ? Math.round(x / this.sizeRatioX)
        : this.scroller.x;
      y = this.options.listenY
        ? Math.round(y / this.sizeRatioY)
        : this.scroller.y;

      this.scroller.scrollTo(x, y);
    },

    fade: function (val, hold) {
      if (hold && !this.visible) {
        return;
      }

      clearTimeout(this.fadeTimeout);
      this.fadeTimeout = null;

      var time = val ? 250 : 500,
        delay = val ? 0 : 300;

      val = val ? "1" : "0";

      this.wrapperStyle[utils.style.transitionDuration] = time + "ms";

      this.fadeTimeout = setTimeout(
        function (val) {
          this.wrapperStyle.opacity = val;
          this.visible = +val;
        }.bind(this, val),
        delay
      );
    },
  };

  IScroll.utils = utils;

  if (typeof module != "undefined" && module.exports) {
    module.exports = IScroll;
  } else if (typeof define == "function" && define.amd) {
    define(function () {
      return IScroll;
    });
  } else {
    window.IScroll = IScroll;
  }
})(window, document, Math);
